Type-writing machine.



F. 0. URSBRUOK. TYPE WRITING MACHINE.

APPLICATION FILED MAR. 30, 1911.

Patented Mar.25,1913.

IINVI-IZNT-OR- MT RNEY also, a spring UNITED STATES PATENT oi rion.

FRANK C. URSBRUCK, OF NEW YORK, N. Y., ASSIGNOR TO UNDER-W901)TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPE-WRITING MACHINE.

Specification of Letters Patent.

Patented Mar. 25, 1913.

Application filed March 30, 1911. Serial No. 617,883.

to increase the efliciency of the clutch which connects the platen tothe line-space wheel, and to render the, mechanism compact, durable, andfinely adjustable.

I preferably employ a double clutch, or two clutches, between the platenand the line-space wheel, which are simultaneously brought into action,so that the resistance of the platen to turning independently of theline-space wheel is greatly increased.

One member of the double clutch consists of a pair of cones, or a coneand cup, and one of these elements has formed or provided thereonanother cone or cup, the latter forming a member of the second pair ofcones. Preferably, the line-space wheel is formed with two cups. Of thetwo cones, one is fixed to the platen axle, and the other is suitablyconnected to a head which is fixed upon the platen axle, so that saidcone must rotate with the axle, but may move longitudinally thereof forreleasing the platen from the line-space wheel. \Vhen said movable coneis pressed home to close the clutch, it presses the line-space wheelbodily, so as to cause the second cup on said line-space wheel tobite'the cone which is fixed on the platen axle; whereby an effectivedouble grip is secured between the line-space wheel and the platen. Thearrangement of cones and cups may, of course, be varied within the scopeof the invention.

The first cone of the series is preferably operated by means of compoundlevers, as in my application No. 57 7 A63, 'filcd August 16, 1910; butin the present construction. the device is rendered more compact, andprovision is made for fine adjustment, so as to render the leverseffective upon slight movement thereof.

According tgsthe resent improvements,

emp oyed' for the purpose of closing the clutch. VVhen it is desired torelease the platen, it is only necessary to press a button; and uponreleasing the but ton, said spring connects the platen to the line-spacewheel.

Other features and advantages will herea inafter appear.

In the accompanying drawings, Figure 1 is a perspective of the carriageof an Underwood typewriting machine provided with my improvements; partsbeing broken away, and .parts shown in section. Fig. 2 is a longitudinalcentral section of the clutch device, in the platen-releasing position.Fig. 3 is a section similar to Fig. 2, showing a portion of thereleasing mechanism, with the clutch closed. Fig. 4 is a cross-sectionalview of the clutching devices. Fig. 5 is a perspective of the frictionring.

The platen 1 is fixed on an axle 2, journaled in the ends 3 of a platenframe. A

line-space wheel 4 is rotatable by a lever (3- operating through a slide7 and pawl 8. A detent 9 engages the ratchet wheel 41.

A cam 12 loose upon axle 2 engages rollers 13 of radiatingclutch-operating levers 14, which are pivoted at15 to rock on a levercarrier or head 16, which is fixed on the axle by a set screw 17. Toes18on these levers press against adjusting screws 19 in the ends of levers20, which are pivoted at 21 on radial arms 22 on the head 16, and thepressure exerted on the levers 2O imparted by toes 23 of the levers 20to a cone 2%, and clamps or presses the cone against a cup or conicalseat 25 formed on the inner end of a barrel or case 26, which extendsfrom the outer face of the line-space wheel. In this way a thrust isexerted longitudinally of the axle 2, and presses or clamps theline-space wheel upon a conical boss 27, which is fixed to the axle by apin 28. The hub 28 of the ratchet wheel has'a conical bore to fit thisconical boss.

The cone or friction ring 24 is provided with two lugs 29 which engageopposite sides of one of'the radial arms 22, and force the ring 24 torotate with the axle 2. A spring '30 between the cam 12 and the head 16is sufficiently strong to close the clutch when the button 10 isreleased.

. The knob 11 is rigid on a hub 31, which is attached to the axle 2rigidly by a pin 31 so that when the, knob 11 is rotated, it

rotates the axle and the head 16, and this rotatesthe cone 24,.and alsothe line-space wheel.

By pushing button 10 inwardly, stems 32, which slide through the hub 31,are caused to force inwardly a sleeve 33, to which their inner ends areattached, and the 0nd of this sleeve presses the cam 12 away from therollers, compressing the spring 30, as indicated in Fig. 2. The sleeve33 is of less diameter than the cam 12, so that the rollers move intoward the axle, and thus relieve the pressure of the levers 14 throughthe levers 20 on the cone 24. In this position the clutch is releasedand the platen can be turned independently of the line-space Wheel.

The ends of the levers 20 are slitted at 34, and sprung to hold theadjusting screws 19 firmly. A cap 35 closes the barrel 26. It will beseen that the clutch mechanism is made very compact and effective.

It will be understood that by providing a conical boss 27 upon which Hehub of the ratchet wheel seats, I multipv the friction or clutchingsurfaces betwem the axle and the line-space wheel. The toes 23 bearagainst wearing blocks 36 which may be set in the face of the clampingring 24:, as shown.

Having thus described my invention, I claim:

1. In a platen release, in combination, a platen, an axle therefor, afriction seat adjacent to said axle, a line-space Wheel disposed againstsaid seat, a friction ring, said line-space wheel having a friction seatfor said ring, and releasable means for simultaneously pressing saidring and said linespace wheel respectively upon said seats.

2. In a platen release, in combination a platen, an axle therefor, aline-space wheel, a plurality of pairs of conical cooperating frictionmembers between the platen and line-space wheel, and means for forciblyinterengaging said pairs of conical friction members simultaneously.

3. In a platen release, in combination, a platen having an axle with afriction seat thereupon, a line-space ,wheel bearing against said seat,and having a friction seat on the side face thereof, a clamping ringbearing upon said second seat, and releasable means for pressing saidclamping ring on said second seat and simultaneously pressing saidline-space wheel upon said first seat.

Copies of this patent may be obtained for a clamping member a camsliding on said :1

4. Zn a platen release, in combination, a platen, an axle therefor, allne-space wheel,

' a clamping member for frictionally clamping said line-space wheel onsaid axle, a lever carrier, a plurality of levers carried therebyengaging said clamping member, a cam sliding on said axis, and camlevers having pivot points en said lever carrier, and engaging said camI, cam levers having toes on the side id pivots adjacent to said cam andengaging said first levers.

5. In a platen rele se, in combination, a platen, an axle thei r, aline-space wheel, ed to said axle for wheel on said axle, e, leversengaging said ham to clamp a fri ion member revolving with said axleagainst said line-space wheel, means for displacingsaid cam fromengagement with said levers, and a spring for returning said .cam intoengagement therewith to re-lock said line-space wheel after release.

6. The combination with a rotatable platen, of a line'space wheel looseon the axle of said platen, a cone fixed on said axle, a conical bore insaidline-space wheel frictionally holding coiiperating with said firstcone, a conical seat 111 said -l1nespace wheel, and a friction membersplined to revolve with said axle to engage said conical seat and locksaid wheel to said platen.

7. The combination with a rotatable platen, of a line-space wheel looseon the aXle of said platen, a cone fixed onsaid axle, a conical bore insaid line-space wheel cooperating with said firstcone, a conical seat insaid line-space wheel, a friction member splined to revolve with saidaxle to engage said conical seat, and a spring-operated lever to movesaid second cone to lock said line-space wheel to said platen.

8. The combination with a rotatable platen, of a line-space wheel looseon the I axle of said platen, a cone fixed on said axle, a conical borein said line-space wheel cooperating with said first cone, a conicalseat in said line-space wheel, friction member splined to revolve withsaid axle, a spring, and a lever operated by said spring to cause saidfriction member to engage said conical seat, and loch said line-spacewheel to said axle. v

FRANK C. URSBRUCK. Witnesses:

PAUL ZIRON, FxD. AMMEN,

five cents each, by addressing the Gommissioner of Katents, Washington,D. G.

